@Kazanjy I once received a C because while I was identified as a A by everyone, they were actually expecting me to do so hence I didnt exceed their initial expectation.
@ImShahinyan I thought Ra1 but then say h1=Q. Then looked at Ra3 but h1=N. Ra4 then e4. So then I realized Ra1, h1=Q, Bxa1! and mate will follow. So what about 1.Bh1 and that's our answer